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Title:

Evaluation and Comparison on the Moisture Susceptibility and Healing Property of Asphalt and Mastic

Accession Number:

01763605

Record Type:

Component

Abstract:

The bond between asphalt and aggregate plays a fundamental role in the mixture’s resistance to moisture damage and cracking. Healing is another inherent property of asphalt which is related to the mixture’s durability. Many studies have investigated the two properties at the meso level, including the binder bond strength (BBS) test. However, it has not been decided whether the test on the unfilled asphalt or mastic could accurately evaluate and predict the mixture performance. In this study, the BBS test was employed to evaluate the bond, moisture susceptibility, and healing property of four representative modified asphalt and the corresponding mastic, including SBS, crumb rubber (CR), high-density polyethylene (HDPE) and gilsonite modifications. The influence of limestone mineral filler on the asphalt was investigated through Fourier transform infrared (FTIR) spectrum experiment. The Hamburg wheel-track test and four-point beam fatigue-healing test were also performed for the correlation between the binder results in BBS test and the mixture performance. The results show that gilsonite enhances the asphalt bond strength, whereas the linear SBS, HDPE, and CR have a negative effect. The HDPE-modified asphalt presents superior healing performance. The limestone mineral filler improves the asphalt bond and moisture susceptibility, except for CR-modified asphalt, but harms the healing capability. The FTIR test results show that the interaction between asphalt and mineral filler is mainly physical rather than chemical. Correlation analyses between binder tests and mixture tests verify that the BBS test on the unfilled asphalt could predict the moisture susceptibility and healing property of mixtures effectively.

Supplemental Notes:

This paper was sponsored by TRB committee AKM40 Standing Committee on Asphalt Mixture Evaluation and Performance.

Report/Paper Numbers:

TRBAM-21-04307

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Zhou, Lu
Huang, Weidong
Lv, Quan

Pagination:

17p

Publication Date:

2021

Conference:

Transportation Research Board 100th Annual Meeting

Location: Washington DC, United States
Date: 2021-1-5 to 2021-1-29
Sponsors: Transportation Research Board; Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-04307

Files:

TRIS, TRB, ATRI

Created Date:

Dec 23 2020 11:07AM